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<p>
      Views are sequences that do not actually contain data, but instead impart an
      alternative presentation over the data from one or more underlying sequences.
      Views are proxies. They provide an efficient yet purely functional way to work
      on potentially expensive sequence operations. Views are inherently lazy. Their
      elements are only computed on demand only when the elements of the underlying
      sequence(s) are actually accessed. Views' lazy nature make them very cheap
      to copy and be passed around by value.
    </p>
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<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">view</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">include</span><span class="special">/</span><span class="identifier">view</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
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        Distributed under the Boost Software License, Version 1.0. (See accompanying
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